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  <title>设置默认字符编码</title>

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</div><hr /><div id="mysqli.set-charset" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mysqli::set_charset</h1>
  <h1 class="refname">mysqli_set_charset</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.0.5)</p><p class="refpurpose"><span class="refname">mysqli::set_charset</span> -- <span class="refname">mysqli_set_charset</span> &mdash; <span class="dc-title">设置默认字符编码</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mysqli.set-charset-description">
  <h3 class="title">说明</h3>
  <p class="para">面向对象风格</p>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>mysqli::set_charset</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$charset</code></span>
   )</div>

  <p class="para rdfs-comment">过程化风格</p>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>mysqli_set_charset</strong></span>
    ( <span class="methodparam"><span class="type"><a href="class.mysqli.html" class="type mysqli">mysqli</a></span> <code class="parameter">$link</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$charset</code></span>
   )</div>

  <p class="para rdfs-comment">
   设置在数据库间传输字符时所用的默认字符编码。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-mysqli.set-charset-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    <dt>
<em><code class="parameter">
link</code></em></dt>
<dd>
<p class="para">仅以过程化样式：由<span class="function"><a href="function.mysqli-connect.html" class="function">mysqli_connect()</a></span> 或 <span class="function"><a href="mysqli.init.html" class="function">mysqli_init()</a></span>
返回的链接标识。</p></dd>

    
     <dt>
<em><code class="parameter">charset</code></em></dt>

     <dd>

      <p class="para">
       被设为默认的字符编码名。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-mysqli.set-charset-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-mysqli.set-charset-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    如果在Windows平台上使用该方法，需要4.1.11版或以上的MySQL客户端库，且MySQL版本为5.0.6以上。
   </p>
  </p></blockquote>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    这应该是首选的用于改变字符编码的方法，不建议使用<span class="function"><a href="mysqli.query.html" class="function">mysqli_query()</a></span>执行SQL请求的<em>SET NAMES ...</em>（如 <em>SET NAMES utf8</em>）。
     详见<a href="mysqlinfo.concepts.charset.html" class="link">MySQL字符集的概念</a>
    
   </p>
  </p></blockquote>
 </div>


 <div class="refsect1 examples" id="refsect1-mysqli.set-charset-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1653">
   <p><strong>Example #1 <span class="methodname"><strong>mysqli::set_charset()</strong></span> example</strong></p>
   <div class="example-contents"><p>面向对象风格</p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$mysqli&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">mysqli</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"my_user"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"my_password"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"test"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;check&nbsp;connection&nbsp;*/<br /></span><span style="color: #007700">if&nbsp;(</span><span style="color: #0000BB">mysqli_connect_errno</span><span style="color: #007700">())&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect&nbsp;failed:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">mysqli_connect_error</span><span style="color: #007700">());<br />&nbsp;&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></span><span style="color: #FF8000">/*&nbsp;change&nbsp;character&nbsp;set&nbsp;to&nbsp;utf8&nbsp;*/<br /></span><span style="color: #007700">if&nbsp;(!</span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">set_charset</span><span style="color: #007700">(</span><span style="color: #DD0000">"utf8"</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Error&nbsp;loading&nbsp;character&nbsp;set&nbsp;utf8:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">error</span><span style="color: #007700">);<br />}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Current&nbsp;character&nbsp;set:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">character_set_name</span><span style="color: #007700">());<br />}<br /><br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>过程化风格</p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$link&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mysqli_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'my_user'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'my_password'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'test'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;check&nbsp;connection&nbsp;*/<br /></span><span style="color: #007700">if&nbsp;(</span><span style="color: #0000BB">mysqli_connect_errno</span><span style="color: #007700">())&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect&nbsp;failed:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">mysqli_connect_error</span><span style="color: #007700">());<br />&nbsp;&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></span><span style="color: #FF8000">/*&nbsp;change&nbsp;character&nbsp;set&nbsp;to&nbsp;utf8&nbsp;*/<br /></span><span style="color: #007700">if&nbsp;(!</span><span style="color: #0000BB">mysqli_set_charset</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"utf8"</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Error&nbsp;loading&nbsp;character&nbsp;set&nbsp;utf8:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">mysqli_error</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">));<br />}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Current&nbsp;character&nbsp;set:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">mysqli_character_set_name</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">));<br />}<br /><br /></span><span style="color: #0000BB">mysqli_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>以上例程会输出：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
Current character set: utf8
</pre></div>
   </div>
  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-mysqli.set-charset-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="mysqli.character-set-name.html" class="function" rel="rdfs-seeAlso">mysqli_character_set_name()</a> - 返回当前数据库连接的默认字符编码</span></li>
    <li class="member"><span class="function"><a href="mysqli.real-escape-string.html" class="function" rel="rdfs-seeAlso">mysqli_real_escape_string()</a> - Escapes special characters in a string for use in an SQL statement, taking into account the current charset of the connection</span></li>
    <li class="member"><a href="http://dev.mysql.com/doc/mysql/en/charset-charsets.html" class="link external">&raquo;&nbsp;关于MySQL支持字符集的列表</a></li>
   </ul>
  </p>
 </div>


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